I think things are moving faster than perhaps is a good idea. If there is some major NRE going on and this change of tune about poly has come about, then holding off on everything else to deal with first that would be the best bet... no trip to Europe (there will be other trips if the guy is rich!), no threesomes, no crazy fucking on her part out of lust and NRE... just a slow gradual process whereby you can catch up with her and deal with the jealousy that has arisen. Not to mention the idea of you now being able to have women in your life!
There is not rush on this and all will play out as it should when it should if things are broken down and taken one step at a time..
by the way, you are awesome too!